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/* nuklear - v1.00 - public domain */
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static void
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calculator(struct nk_context *ctx)
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{
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if (nk_begin(ctx, "Calculator", nk_rect(10, 10, 180, 250),
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NK_WINDOW_BORDER|NK_WINDOW_NO_SCROLLBAR|NK_WINDOW_MOVABLE))
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{
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static int set = 0, prev = 0, op = 0;
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static const char numbers[] = "789456123";
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static const char ops[] = "+-*/";
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static double a = 0, b = 0;
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static double *current = &a;
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size_t i = 0;
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int solve = 0;
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{int len; char buffer[256];
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nk_layout_row_dynamic(ctx, 35, 1);
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len = snprintf(buffer, 256, "%.2f", *current);
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nk_edit_string(ctx, NK_EDIT_SIMPLE, buffer, &len, 255, nk_filter_float);
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buffer[len] = 0;
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*current = atof(buffer);}
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nk_layout_row_dynamic(ctx, 35, 4);
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for (i = 0; i < 16; ++i) {
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if (i >= 12 && i < 15) {
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if (i > 12) continue;
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if (nk_button_label(ctx, "C")) {
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a = b = op = 0; current = &a; set = 0;
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} if (nk_button_label(ctx, "0")) {
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*current = *current*10.0f; set = 0;
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} if (nk_button_label(ctx, "=")) {
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solve = 1; prev = op; op = 0;
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}
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} else if (((i+1) % 4)) {
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if (nk_button_text(ctx, &numbers[(i/4)*3+i%4], 1)) {
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*current = *current * 10.0f + numbers[(i/4)*3+i%4] - '0';
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set = 0;
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}
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} else if (nk_button_text(ctx, &ops[i/4], 1)) {
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if (!set) {
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if (current != &b) {
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current = &b;
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} else {
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prev = op;
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solve = 1;
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}
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}
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op = ops[i/4];
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set = 1;
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}
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}
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if (solve) {
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if (prev == '+') a = a + b;
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if (prev == '-') a = a - b;
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if (prev == '*') a = a * b;
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if (prev == '/') a = a / b;
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current = &a;
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if (set) current = &b;
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b = 0; set = 0;
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}
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}
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nk_end(ctx);
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}
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